INDIANAPOLIS — Federal health officials say the number of Indiana cases of fungal meningitis linked to a tainted back pain medication has risen to 15.

The Centers for Disease Control and Prevention on Wednesday added three more confirmed cases to the 12 previously known. It says the number of people nationwide sickened by the outbreak now has reached 137 cases, including 12 deaths.

No deaths from the outbreak have been reported in Indiana.

Indiana's cases involve patients at six Indiana health facilities that received a recalled steroid produced by a specialty pharmacy in Massachusetts. The clinics are in Elkhart, Evansville, Fort Wayne, South Bend, Terre Haute and Columbus.

Indiana health officials have said about 1,500 people in the state are known to have received injections of the drug.